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生日快乐

/*

Shape Shifter

A canvas experiment by Kenneth Cachia
http://www.kennethcachia.com

Updated code

https://github.com/kennethcachia/Shape-Shifter

*/

var S = {
init: function () {
var action = window.location.href,
i = action.indexOf('?a=');

S.Drawing.init('.canvas');
document.body.classList.add('body--ready');

if (i !== -1) {
  S.UI.simulate(decodeURI(action).substring(i + 3));
} else {
  S.UI.simulate('|#countdown 3||某|某|祝|你|生|日|快|乐|#rectangle|');
}

S.Drawing.loop(function () {
  S.Shape.render();
});

}
};

S.Drawing = (function () {
var canvas,
context,
renderFn
requestFrame = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(callback) {
window.setTimeout(callback, 1000 / 60);
};

return {
init: function (el) {
canvas = document.querySelector(el);
context = canvas.getContext('2d');
this.adjustCanvas();

  window.addEventListener('resize', function (e) {
    S.Drawing.adjustCanvas();
  });
},

loop: function (fn) {
  renderFn = !renderFn ? fn : renderFn;
  this.clearFrame();
  renderFn();
  requestFrame.call(window, this.loop.bind(this));
},

adjustCanvas: function () {
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
},

clearFrame: function () {
  context.clearRect(0, 0, canvas.width, canvas.height);
},

getArea: function () {
  return { w: canvas.width, h: canvas.height };
},

drawCircle: function (p, c) {
  context.fillStyle = c.render();
  context.beginPath();
  context.arc(p.x, p.y, p.z, 0, 2 * Math.PI, true);
  context.closePath();
  context.fill();
}

}
}());

S.UI = (function () {
var canvas = document.querySelector('.canvas'),
interval,
isTouch = false, //('ontouchstart' in window || navigator.msMaxTouchPoints),
currentAction,
resizeTimer,
time,
maxShapeSize = 30,
firstAction = true,
sequence = [],
cmd = '#';

function formatTime(date) {
var h = date.getHours(),
m = date.getMinutes(),
m = m < 10 ? '0' + m : m;
return h + ':' + m;
}

function getValue(value) {
return value && value.split(' ')[1];
}

function getAction(value) {
value = value && value.split(' ')[0];
return value && value[0] === cmd && value.substring(1);
}

function timedAction(fn, delay, max, reverse) {
clearInterval(interval);
currentAction = reverse ? max : 1;
fn(currentAction);

if (!max || (!reverse && currentAction < max) || (reverse && currentAction > 0)) {
  interval = setInterval(function () {
    currentAction = reverse ? currentAction - 1 : currentAction + 1;
    fn(currentAction);

    if ((!reverse && max && currentAction === max) || (reverse && currentAction === 0)) {
      clearInterval(interval);
    }
  }, delay);
}

}

function reset(destroy) {
clearInterval(interval);
sequence = [];
time = null;
destroy && S.Shape.switchShape(S.ShapeBuilder.letter(''));
}

function performAction(value) {
var action,
value,
current;

// overlay.classList.remove('overlay--visible');
sequence = typeof(value) === 'object' ? value : sequence.concat(value.split('|'));
// input.value = '';
// checkInputWidth();

timedAction(function (index) {
  current = sequence.shift();
  action = getAction(current);
  value = getValue(current);

  switch (action) {
    case 'countdown':
      value = parseInt(value) || 10;
      value = value > 0 ? value : 10;

      timedAction(function (index) {
        if (index === 0) {
          if (sequence.length === 0) {
            S.Shape.switchShape(S.ShapeBuilder.letter(''));
          } else {
            performAction(sequence);
          }
        } else {
          S.Shape.switchShape(S.ShapeBuilder.letter(index), true);
        }
      }, 1000, value, true);
      break;

    case 'rectangle':
      value = value && value.split('x');
      value = (value && value.length === 2) ? value : [maxShapeSize, maxShapeSize / 2];

      S.Shape.switchShape(S.ShapeBuilder.rectangle(Math.min(maxShapeSize, parseInt(value[0])), Math.min(maxShapeSize, parseInt(value[1]))));
      break;

    case 'circle':
      value = parseInt(value) || maxShapeSize;
      value = Math.min(value, maxShapeSize);
      S.Shape.switchShape(S.ShapeBuilder.circle(value));
      break;

    case 'time':
      var t = formatTime(new Date());

      if (sequence.length > 0) {
        S.Shape.switchShape(S.ShapeBuilder.letter(t));
      } else {
        timedAction(function () {
          t = formatTime(new Date());
          if (t !== time) {
            time = t;
            S.Shape.switchShape(S.ShapeBuilder.letter(time));
          }
        }, 1000);
      }
      break;

    default:
      S.Shape.switchShape(S.ShapeBuilder.letter(current[0] === cmd ? 'What?' : current));
  }
}, 2000, sequence.length);

}

function checkInputWidth(e) {
if (input.value.length > 18) {
ui.classList.add('ui--wide');
} else {
ui.classList.remove('ui--wide');
}

if (firstAction && input.value.length > 0) {
  ui.classList.add('ui--enter');
} else {
  ui.classList.remove('ui--enter');
}

}

function bindEvents() {
document.body.addEventListener('keydown', function (e) {
input.focus();

  if (e.keyCode === 13) {
    firstAction = false;
    reset();
    performAction(input.value);
  }
});

// input.addEventListener('input', checkInputWidth);
// input.addEventListener('change', checkInputWidth);
// input.addEventListener('focus', checkInputWidth);

// help.addEventListener('click', function (e) {
//   overlay.classList.toggle('overlay--visible');
//   overlay.classList.contains('overlay--visible') && reset(true);
// });

// commands.addEventListener('click', function (e) {
//   var el,
//       info,
//       demo,
//       tab,
//       active,
//       url;
//
//   if (e.target.classList.contains('commands-item')) {
//     el = e.target;
//   } else {
//     el = e.target.parentNode.classList.contains('commands-item') ? e.target.parentNode : e.target.parentNode.parentNode;
//   }
//
//   info = el && el.querySelector('.commands-item-info');
//   demo = el && info.getAttribute('data-demo');
//   url = el && info.getAttribute('data-url');
//
//   if (info) {
//     overlay.classList.remove('overlay--visible');
//
//     if (demo) {
//       input.value = demo;
//
//       if (isTouch) {
//         reset();
//         performAction(input.value);
//       } else {
//         input.focus();
//       }
//     } else if (url) {
//       //window.location = url;
//     }
//   }
// });

canvas.addEventListener('click', function (e) {
  overlay.classList.remove('overlay--visible');
});

}

function init() {
bindEvents();
// input.focus();
isTouch && document.body.classList.add('touch');
}

// Init
init();

return {
simulate: function (action) {
performAction(action);
}
}
}());

S.UI.Tabs = (function () {
var tabs = document.querySelector('.tabs'),
labels = document.querySelector('.tabs-labels'),
triggers = document.querySelectorAll('.tabs-label'),
panels = document.querySelectorAll('.tabs-panel');

function activate(i) {
triggers[i].classList.add('tabs-label--active');
panels[i].classList.add('tabs-panel--active');
}

function bindEvents() {
labels.addEventListener('click', function (e) {
var el = e.target,
index;

  if (el.classList.contains('tabs-label')) {
    for (var t = 0; t < triggers.length; t++) {
      triggers[t].classList.remove('tabs-label--active');
      panels[t].classList.remove('tabs-panel--active');

      if (el === triggers[t]) {
        index = t;
      }
    }

    activate(index);
  }
});

}

function init() {
activate(0);
bindEvents();
}

// Init
init();
}());

S.Point = function (args) {
this.x = args.x;
this.y = args.y;
this.z = args.z;
this.a = args.a;
this.h = args.h;
};

S.Color = function (r, g, b, a) {
this.r = r;
this.g = g;
this.b = b;
this.a = a;
};

S.Color.prototype = {
render: function () {
return 'rgba(' + this.r + ',' + + this.g + ',' + this.b + ',' + this.a + ')';
}
};

S.Dot = function (x, y) {
this.p = new S.Point({
x: x,
y: y,
z: 5,
a: 1,
h: 0
});

this.e = 0.07;
this.s = true;

this.c = new S.Color(255, 255, 255, this.p.a);

this.t = this.clone();
this.q = [];
};

S.Dot.prototype = {
clone: function () {
return new S.Point({
x: this.x,
y: this.y,
z: this.z,
a: this.a,
h: this.h
});
},

_draw: function () {
this.c.a = this.p.a;
S.Drawing.drawCircle(this.p, this.c);
},

_moveTowards: function (n) {
var details = this.distanceTo(n, true),
dx = details[0],
dy = details[1],
d = details[2],
e = this.e * d;

if (this.p.h === -1) {
  this.p.x = n.x;
  this.p.y = n.y;
  return true;
}

if (d > 1) {
  this.p.x -= ((dx / d) * e);
  this.p.y -= ((dy / d) * e);
} else {
  if (this.p.h > 0) {
    this.p.h--;
  } else {
    return true;
  }
}

return false;

},

_update: function () {
if (this._moveTowards(this.t)) {
var p = this.q.shift();

  if (p) {
    this.t.x = p.x || this.p.x;
    this.t.y = p.y || this.p.y;
    this.t.z = p.z || this.p.z;
    this.t.a = p.a || this.p.a;
    this.p.h = p.h || 0;
  } else {
    if (this.s) {
      this.p.x -= Math.sin(Math.random() * 3.142);
      this.p.y -= Math.sin(Math.random() * 3.142);
    } else {
      this.move(new S.Point({
        x: this.p.x + (Math.random() * 50) - 25,
        y: this.p.y + (Math.random() * 50) - 25,
      }));
    }
  }
}

d = this.p.a - this.t.a;
this.p.a = Math.max(0.1, this.p.a - (d * 0.05));
d = this.p.z - this.t.z;
this.p.z = Math.max(1, this.p.z - (d * 0.05));

},

distanceTo: function (n, details) {
var dx = this.p.x - n.x,
dy = this.p.y - n.y,
d = Math.sqrt(dx * dx + dy * dy);

return details ? [dx, dy, d] : d;

},

move: function (p, avoidStatic) {
if (!avoidStatic || (avoidStatic && this.distanceTo(p) > 1)) {
this.q.push(p);
}
},

render: function () {
this._update();
this._draw();
}
}

S.ShapeBuilder = (function () {
var gap = 13,
shapeCanvas = document.createElement('canvas'),
shapeContext = shapeCanvas.getContext('2d'),
fontSize = 500,
fontFamily = 'Avenir, Helvetica Neue, Helvetica, Arial, sans-serif';

function fit() {
shapeCanvas.width = Math.floor(window.innerWidth / gap) * gap;
shapeCanvas.height = Math.floor(window.innerHeight / gap) * gap;
shapeContext.fillStyle = 'red';
shapeContext.textBaseline = 'middle';
shapeContext.textAlign = 'center';
}

function processCanvas() {
var pixels = shapeContext.getImageData(0, 0, shapeCanvas.width, shapeCanvas.height).data;
dots = [],
pixels,
x = 0,
y = 0,
fx = shapeCanvas.width,
fy = shapeCanvas.height,
w = 0,
h = 0;

for (var p = 0; p < pixels.length; p += (4 * gap)) {
  if (pixels[p + 3] > 0) {
    dots.push(new S.Point({
      x: x,
      y: y
    }));

    w = x > w ? x : w;
    h = y > h ? y : h;
    fx = x < fx ? x : fx;
    fy = y < fy ? y : fy;
  }

  x += gap;

  if (x >= shapeCanvas.width) {
    x = 0;
    y += gap;
    p += gap * 4 * shapeCanvas.width;
  }
}

return { dots: dots, w: w + fx, h: h + fy };

}

function setFontSize(s) {
shapeContext.font = 'bold ' + s + 'px ' + fontFamily;
}

function isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}

function init() {
fit();
window.addEventListener('resize', fit);
}

// Init
init();

return {
imageFile: function (url, callback) {
var image = new Image(),
a = S.Drawing.getArea();

  image.onload = function () {
    shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
    shapeContext.drawImage(this, 0, 0, a.h * 0.6, a.h * 0.6);
    callback(processCanvas());
  };

  image.onerror = function () {
    callback(S.ShapeBuilder.letter('What?'));
  }

  image.src = url;
},

circle: function (d) {
  var r = Math.max(0, d) / 2;
  shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
  shapeContext.beginPath();
  shapeContext.arc(r * gap, r * gap, r * gap, 0, 2 * Math.PI, false);
  shapeContext.fill();
  shapeContext.closePath();

  return processCanvas();
},

letter: function (l) {
  var s = 0;

  setFontSize(fontSize);
  s = Math.min(fontSize,
              (shapeCanvas.width / shapeContext.measureText(l).width) * 0.8 * fontSize,
              (shapeCanvas.height / fontSize) * (isNumber(l) ? 1 : 0.45) * fontSize);
  setFontSize(s);

  shapeContext.clearRect(0, 0, shapeCanvas.width, shapeCanvas.height);
  shapeContext.fillText(l, shapeCanvas.width / 2, shapeCanvas.height / 2);

  return processCanvas();
},

rectangle: function (w, h) {
  var dots = [],
      width = gap * w,
      height = gap * h;

  for (var y = 0; y < height; y += gap) {
    for (var x = 0; x < width; x += gap) {
      dots.push(new S.Point({
        x: x,
        y: y,
      }));
    }
  }

  return { dots: dots, w: width, h: height };
}

};
}());

S.Shape = (function () {
var dots = [],
width = 0,
height = 0,
cx = 0,
cy = 0;

function compensate() {
var a = S.Drawing.getArea();

cx = a.w / 2 - width / 2;
cy = a.h / 2 - height / 2;

}

return {
shuffleIdle: function () {
var a = S.Drawing.getArea();

  for (var d = 0; d < dots.length; d++) {
    if (!dots[d].s) {
      dots[d].move({
        x: Math.random() * a.w,
        y: Math.random() * a.h
      });
    }
  }
},

switchShape: function (n, fast) {
  var size,
      a = S.Drawing.getArea();

  width = n.w;
  height = n.h;

  compensate();

  if (n.dots.length > dots.length) {
    size = n.dots.length - dots.length;
    for (var d = 1; d <= size; d++) {
      dots.push(new S.Dot(a.w / 2, a.h / 2));
    }
  }

  var d = 0,
      i = 0;

  while (n.dots.length > 0) {
    i = Math.floor(Math.random() * n.dots.length);
    dots[d].e = fast ? 0.25 : (dots[d].s ? 0.14 : 0.11);

    if (dots[d].s) {
      dots[d].move(new S.Point({
        z: Math.random() * 20 + 10,
        a: Math.random(),
        h: 18
      }));
    } else {
      dots[d].move(new S.Point({
        z: Math.random() * 5 + 5,
        h: fast ? 18 : 30
      }));
    }

    dots[d].s = true;
    dots[d].move(new S.Point({
      x: n.dots[i].x + cx,
      y: n.dots[i].y + cy,
      a: 1,
      z: 5,
      h: 0
    }));

    n.dots = n.dots.slice(0, i).concat(n.dots.slice(i + 1));
    d++;
  }

  for (var i = d; i < dots.length; i++) {
    if (dots[i].s) {
      dots[i].move(new S.Point({
        z: Math.random() * 20 + 10,
        a: Math.random(),
        h: 20
      }));

      dots[i].s = false;
      dots[i].e = 0.04;
      dots[i].move(new S.Point({
        x: Math.random() * a.w,
        y: Math.random() * a.h,
        a: 0.3, //.4
        z: Math.random() * 4,
        h: 0
      }));
    }
  }
},

render: function () {
  for (var d = 0; d < dots.length; d++) {
    dots[d].render();
  }
}

}
}());

S.init();

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